After playing with her toy dinosaurs in Gran Gran's garden, JoJo decides she would love to see a real-life dinosaur! Gran Gran takes her to the museum to see the fossilised skeleton of a Tyrannosaurus rex, explaining that dinosaurs lived a very long time ago! However, it's more difficult to find the T-rex than she imagined, despite it's size. JoJo and Gran Gran get lost through time as they explore the large museum, and it's only when Ezra the tour guide gives them guidance that JoJo and Gran Gran find the amazing artefact!